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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f8bde49906b3735daeefc0c946e90a99007708b34f7da92a1954a062c629a3' 
  AND token = 'A96peg0K2u93CMTcY6wXgYO8TJEJ5d5yoQ6xBkVPWao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}